| 摘要 |
A refrigerating machine oil composition for carbon dioxide (CO2) refrigerant for use in compression type refrigerating machines such as car air conditioners, refrigerators, freezers, air conditioners, and heat pumps, whi ch comprises a base oil consisting mainly of an oxygenic organic compound and having a dynamic viscosity at 100 ~C of 5 to 50 mm2/s, a viscosity index of 60 or higher, and a water content of 300 ppm or lower.
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